68918978 has 4 divisors (see below), whose sum is σ = 103378470. Its totient is φ = 34459488.

The previous prime is 68918957. The next prime is 68918989. The reversal of 68918978 is 87981986.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42159049 + 26759929 = 6493^2 + 5173^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17229743 + ... + 17229746.

Almost surely, 2^68918978 is an apocalyptic number.

68918978 is a deficient number, since it is larger than the sum of its proper divisors (34459492).

68918978 is a wasteful number, since it uses less digits than its factorization.

68918978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34459491.

The product of its digits is 1741824, while the sum is 56.

The square root of 68918978 is about 8301.7454791146. The cubic root of 68918978 is about 409.9959904426.

It can be divided in two parts, 68918 and 978, that added together give a palindrome (69896).

The spelling of 68918978 in words is "sixty-eight million, nine hundred eighteen thousand, nine hundred seventy-eight".